Concepts of Biology
1st Edition
ISBN: 9781938168116
Author: Samantha Fowler, Rebecca Roush, James Wise
Publisher: OpenStax College
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Textbook Question
Chapter 17, Problem 2ACQ
Figure 17.6 Influenza virus is packaged in a viral envelope, which fuses with the plasma membrane. This way, the virus can exit the host cell without killing it. What advantage does the virus gain by keeping the host cell alive?
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Which of the following highly contagious viruses is a single-stranded ribonucleic acid (RNA) virus with a helical capsid and envelope and is transmitted by coming in contact with respiratory secretions?
"This is a highly contagious respiratory illness transmitted when an infected person coughs or sneezes virus particles into the air," the health department said in a written statement. "It's so contagious that if one person is sick and spreading measles, nine out of 10 people around them who aren't immune will get it, too."
Group of answer choices
a. Measles
b. Parvovirus
c. Coxsackie virus A
d. Rhinovirus
In electron micrographs of HSV infection, it can be seen that the intact virus initially reacts
with cell-surface proteoglycans, then with specific receptors. This is later followed by viral
capsids docking with nuclear pores. Afterward, the capsids go from being full to being
"empty." Which of the following statements best fits these observations?
The viral envelope is not required for infectivity, since the envelope does not enter the
nucleus.
The viral envelope mediates entry into the cell, the capsid mediates entry into the
nuclear membrane, and the genome is all that enters the nucleus.
Only the genetic material of the virus is involved in the cell's infectivity, and is injected
into the host cell like the genome of a phage.
Viral capsids are needed for the cell to become infected; since the full capsids enter the
nucleus.
Researchers studying the SARS-CoV-2 virus, also known as COVID-19, have found that the
virus is able to circumvent its host cell's normal defenses by leaving the cell via its lyso-
somes rather than its normal secretory vesicles, as illustrated in the figure below.
endoplasmic
reticulum
nucleus
disrupted
lysosomal functions
Entry and egress of the SARS-CoV-2 virus
A
Golgi complex
Which of the following best explains their findings?
B
lysosome
(deacidified)
С
lysosome
(acidified)
B-coronavirus
normal
biosynthetic
pathway
egress via
lysosomal
trafficking
SARS-CoV-2 inhibits lysosomes of its host cells by decreasing the pH within them.
SARS-CoV-2 activates lysosomes of its host cells by decreasing the pH within them.
SARS-CoV-2 activates lysosomes of its host cells by increasing the pH within them.
D SARS-CoV-2 inhibits lysosomes of its host cells by increasing the pH within them.
Chapter 17 Solutions
Concepts of Biology
Ch. 17 - Figure 17.5 Which of the following statements...Ch. 17 - Figure 17.6 Influenza virus is packaged in a viral...Ch. 17 - Figure 17.17 The Rh antigen is found on...Ch. 17 - Which statement is true? a. A virion contains DNA...Ch. 17 - The viral ________ plays a role in attaching a...Ch. 17 - Which statement is true of viral replication? a....Ch. 17 - Which of the following is a barrier against...Ch. 17 - Although interferons have several effects, they...Ch. 17 - Which innate immune system component uses MHC...Ch. 17 - The humoral immune response depends on which...
Ch. 17 - The fact that the body does not normally mount an...Ch. 17 - Foreign particles circulating in the blood are...Ch. 17 - Allergy to pollen is classified as _______. a. an...Ch. 17 - A potential cause of acquired autoimmunity is...Ch. 17 - Autoantibodies are probably involved in ________....Ch. 17 - Why can’t dogs catch the measles?Ch. 17 - Why is immunization after being bitten by a rabid...Ch. 17 - Different MHC class I molecules between donor and...Ch. 17 - If a series of genetic mutations prevented some,...Ch. 17 - How do B and T cells differ with respect to...Ch. 17 - Why is the immune response after reinfection much...Ch. 17 - Some photographers develop a sensitivity to...
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